/**
 * #      1358
 * 名称   包含所有三种字符的子字符串数目
 * 链接   https://leetcode-cn.com/problems/number-of-substrings-containing-all-three-characters
 * 题解   [90](https://leetcode-cn.com/problems/number-of-substrings-containing-all-three-characters/solution)
 * 通过率 46.8%
 * 难道   中等
 */

